Contactless Flow Measurement on Fish Ladder

Flowing Waters - Special Constructions


  • Concrete intake channel
  • 3.0 x 2.0 m (w x h)
  • Partially filled
  • Gravel bed


Definition of tasks

  • Flow measurement to ensure a minimum water volume required for the fish ladder
  • No sensors can be installed on the channel bottom
  • Contactless measurement if possible on inaccessible point (risk of vandalism)
  • Medium accuracy requirements


  • A contactless surface radar system Type OFR was installed in the fish ladder approach under a bridge.
  • The system measures the speed of surface waves resulting from the rough channel bottom (gravel bed). The current flow rate is calulated from this velocity and the current flow level which is measured contactlessly as well.
  • The flow rate is passed on as mA signal to a PLC on site which controls the position of a slide valve upstream of the measurement point


  • Contactless measurement system
  • "Invisible" sensors
  • Low installation and commissioning efforts

Used products

Haven't found the appropriate product?

Product Consultation

You want to have the best information about our products? Our experts will gladly develop together with you the best solution system for your application.


You have questions about your NIVUS products in use? Our service hotline will readily support you.

We are glad to have you here! For any question regarding water or digitisation we are happy to answer you call or your email message.
Im Täle 2
75031 Eppingen